I've read many sad stories from frustrated woodworkers about the difficulties they are having installing the Crush Grind peppermill mechanisms. The need for Metric boring bits or uncommon sizes of imperial boring bits. Cutting off the locking tabs or eliminating the ribs having to use the exact type or make of epoxy to make sure it will adhere to the plastic parts.
I have grown quite fond of these CG mechanisms but I had many of the same issues mentioned above. So being the wood nut and non-professional design guy that I am, I have developed a different method to install the plastic parts into my turned wooden mills that doesn't require metric drills, no cutting off tabs or ribs, no epoxy or any of those difficult to use and expensive slot cutters. This is a fool proof method that I use with all my mills now.
I'm just now completing an AutoCad drawing that shows how I have made this a simpler process.
I'd be happy to share drawings if you might be interested.